5In section 9 (certificates of completion)—
(a)in subsection (2), for the words “but only if, they are satisfied that” there shall be substituted the words “, so far as they are able to ascertain after taking all reasonable steps in that behalf,” ;
(b)in subsection (3), for the words “be satisfied as mentioned in the last foregoing subsection” there shall be substituted the words “grant a certificate of completion” ;
(c)after subsection (3) there shall be inserted the following subsection—
“(3A)In respect of so much of a building as consists of such an installation as may be prescribed, not being an electrical installation, a buildings authority shall not grant a certificate of completion unless there is produced to them a certificate granted by a person of such class as may be prescribed certifying that the installation complies with such of the said conditions as relate to it :
Provided that this subsection shall not apply in a case where it is shown to hte satisfaction of the buildings authority that for some reasonable cause such a certificate cannot be produced.”;
(d)in subsection (4) for the words “the last foregoing subsection” there shall be substituted the words “subsection (3) or (3A) above”.